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Array substrate for liquid crystal display device

a liquid crystal display and array substrate technology, applied in semiconductor devices, instruments, electrical devices, etc., can solve the problems of ips mode lcd device having limiting the area of the pixel region, and lcd device using the vertical electric field perpendicular to the array substrate has a relatively narrow viewing angl

Active Publication Date: 2015-03-24
LG DISPLAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This design enhances the aperture ratio and reliability of the array substrate, enabling higher resolution in fringe field switching mode liquid crystal display devices while maintaining excellent mobility and reducing off-current due to the dual gate structure of the thin film transistors.

Problems solved by technology

However, the LCD device using the vertical electric field perpendicular to the array substrate has a relatively narrow viewing angle.
However, the IPS mode LCD device has a relatively low aperture ratio and a relatively low transmittance.
However, since the area of the pixel region relates to elements of the display device, disposition of the elements and an aperture ratio of the display device, there is a limitation on decreasing the area of the pixel region.

Method used

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  • Array substrate for liquid crystal display device
  • Array substrate for liquid crystal display device
  • Array substrate for liquid crystal display device

Examples

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first embodiment

[0028]FIG. 2 is a plan view showing an array substrate for a fringe field switching mode liquid crystal display device according to the present invention.

[0029]In FIG. 2, a gate line 113 and a data line 130 are formed in a display region on a substrate 101 for a fringe field switching (FFS) mode liquid crystal display (LCD) device. Each of the gate line 113 and the data line 130 includes a metallic material. For example, at least one of aluminum (Al), aluminum alloy such as aluminum neodymium (AlNd), copper (Cu), copper alloy, molybdenum (Mo) and molybdenum alloy such as molybdenum titanium (MoTi) may be used for each of the gate line 113 and the data line 130. The gate line 113 and the data line 130 cross each other to define a region P. For example, the data line 130 may include first and second data lines 130a and 130b spaced apart from each other and parallel to a vertical direction, and the pixel region P may include first and second pixel regions P1 and P2 disposed along the v...

second embodiment

[0057]FIGS. 6, 7 and 8 are cross-sectional views showing an array substrate for a fringe field switching mode liquid crystal display device according to the present invention. FIGS. 6, 7 and 8 show cross-sections corresponding to lines IV-IV and V-V, respectively, of FIG. 2.

[0058]In FIGS. 6 to 8, a buffer layer 203 is formed on a substrate 201. The buffer layer 203 may include an inorganic insulating material such as silicon oxide (SiO2) or silicon nitride (SiNx), and the substrate 201 may include a transparent insulating material such as glass or plastic. When amorphous silicon is crystallized to polycrystalline silicon, an alkali ion such as potassium ion (K+) or sodium ion (Na+) may be erupted from the substrate by a laser or a heat. The buffer layer 203 blocks the alkali ion to prevent deterioration of a semiconductor layer of polycrystalline silicon due to the alkali ion. The buffer layer 203 may be omitted in another embodiment.

[0059]A semiconductor layer 205 of polycrystallin...

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Abstract

An array substrate for a liquid crystal display device, comprises: a substrate having a display region and a non-display region; a gate line and first and second data lines on the substrate; first and second thin film transistors in the first and second pixel regions, respectively, the first thin film transistor connected to the gate line and the first data line, the second thin film transistor connected to the gate line and the second data line; a planarization layer on the first and second thin film transistors, the planarization layer having a drain contact hole exposing both of drain electrodes of the first and second thin film transistors; and a pixel electrode and a common electrode over the planarization layer.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]The present application claims the benefit of priority of Korean Patent Application No. 10-2013-0047867 filed in the Republic of Korea on Apr. 30, 2013, which is hereby incorporated by reference in its entirety.FIELD OF THE DISCLOSURE[0002]The present disclosure relates to a liquid crystal display device. The present disclosure also relates to an array substrate for a fringe field switching mode liquid crystal display device where aperture ratio is improved.DISCUSSION OF THE RELATED ART[0003]A liquid crystal display (LCD) device, which is advantageous to displaying moving images and popularly used for a display of a portable device, a monitor of a computer and a television due to a high contrast ratio, forms images based on optical anisotropy and polarization of liquid crystal molecules. Since the liquid crystal molecule has a thin and long profile, arrangement of the liquid crystal molecule has a direction. When the liquid crystal molecu...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H01L21/00G02F1/1362H01L27/12
CPCG02F1/1362H01L27/124G02F1/134363G02F1/136227G02F1/134345G02F1/134372G02F1/1343
Inventor CHUNG, EUI-HYUNLEE, JUNG-ILKIM, KA-KYUNG
Owner LG DISPLAY CO LTD